JPH01281595A - Electronic cash register - Google Patents

Abstract

PURPOSE:To suppress power consumption and to save maintenance control cost by arranging a sensor for detecting the presence/absence of an operator, and when the operator lefts a working position after ending sales registering work, automatically interrupting driving voltage to a control part. CONSTITUTION:When the operator left the front position of a keyboard after ending the sales registering work and only a power supply switch 17 is still ON, an H level absence signal is outputted from the sensor 15. Both the input terminals of a NOR gate 25 returned to the H level and an output terminal is also turned to the H level, so that a relay 20 is not driven. Thereby, a DC voltage is not supplied from a rectifier circuit 19 to a DC power supply circuit 22. When the operator exists in front of the keyboard, the sensor 15 outputs an L level absence signal. Thereby, an L level signal is impressed from the gate 25 to the relay 20, the contact of the relay 20 is closed, the circuit 22 is driven, the reset states of the control part 23 and an FF 30 are released and normal operation is restored. Consequently, power consuption is suppressed and the maintenance control price can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic cash register in which the drive voltage is automatically cut off in the absence of an operator.

[Prior Art] In electronic cash registers installed in stores, etc.
If drive voltage continues to be supplied to the electronic cash register even when there are no customers for a long time, power consumption increases and maintenance costs rise.

In order to eliminate this inconvenience, an electronic cash register has been proposed that turns off the display and switches the control section consisting of a microcomputer to a hold state when no registration is actually being performed. There is.

Such an electronic cash register is configured as shown in FIG. 4, for example. That is, the 1oov AC voltage supplied from the AC type R1 via the power switch 2 is reduced to a low voltage by the power transformer 3, and then converted to a voltage of 6 to 8 V, for example, by the rectifier circuit 4 consisting of a diode bridge circuit 4a and a smoothing capacitor 4b. It is converted into a DC voltage V. The DC voltage V is converted into a constant drive voltage VC of +5V by the next DC power supply circuit 5, and is supplied to a control unit 6 composed of, for example, a CPU.

This DC power supply circuit 5 is supplied with the DC voltage V1 from the rectifier circuit 4, and when the drive voltage VC output to the control unit 6 increases and reaches the lower limit voltage value of the allowable range, the reset signal R3T is canceled and the control unit 6 transitions to the operating state. Further, when a power outage accident occurs, a power outage detection signal POFF is sent out. Power outage response processing such as memory evacuation is then executed on the control unit 6 side. Thereafter, when the drive voltage VC falls below the lower limit voltage value, a reset signal RST is output.

In such a circuit configuration, when the reset signal RST is released, the control section 6 waits for sales data to be input by key operation on the keyboard, as shown in FIG. Execute predetermined sales registration processing. When it is confirmed that the sales registration process for - number of customers has been completed, for example, by pressing the close key on the keyboard, the display unit turns off the display after waiting for the predetermined time required for the transfer of money to elapse, and the CPU The control unit 6 consisting of the following is shifted to a hold state. Then, the process returns to the top of the flowchart and waits for the next customer to press a key on the keyboard.

Note that the hold state of the control section 6 is to release the control state of each electronic device connected to this control section 6, such as the display section or a printer that prints sales registration data on a receipt. Therefore, when the control unit 6 shifts to the hold state, power to each electronic device is cut off, so power consumption is suppressed.

Note that if a key is operated in the hold state, the hold state is released.

[Problems to be Solved by the Invention] However, even in the electronic cash registers shown in FIGS. 4 and 5, it cannot be said that power consumption is sufficiently suppressed. That is, even in the hold state, the control section 6 needs to constantly monitor key operations on the keyboard, so it has been impossible to cut off the drive voltage vc supplied to the control section 6.

Therefore, there is a certain limit value that depends on the power consumed by the control unit 6 in suppressing power consumption.

The present invention provides a sensor that detects whether the operator is present or absent, and automatically cuts off the drive voltage to the control unit when the sales registration task is completed and the operator leaves the location, thereby increasing the power consumption. The purpose of the present invention is to provide an electronic cash register that can suppress consumption and significantly reduce maintenance costs.

[Means for Solving the Problems] In order to solve the above-mentioned three problems, the electronic cash register of the present invention includes a keyboard on the front surface of the housing in which a keyboard for inputting sales data and a display section for displaying sales data are provided. A DC power supply is equipped with a sensor that detects whether an operator is present or absent in front, and also supplies drive voltage to a rectifier circuit for the AC power supply and a control unit that executes predetermined sales registration operations based on input sales data. A switching circuit is inserted between the power supply circuit and the presence signal output from the sensor is sent to the switching circuit as a conduction signal, and a power cutoff signal output from the control unit and the power cutoff signal output from the sensor are output from the sensor after the sales registration process is completed. A logic circuit is provided which sends an AND signal with the absence signal as a cutoff signal to the switching circuit.

[Function] With the electronic cash register configured as described above, when the operator reaches the front of the keyboard provided on the front of the electronic cash register housing, the sensor is activated and a presence signal is sent through the logic circuit. The signal is sent to the switching circuit, and the switching circuit becomes conductive. As a result, a driving voltage is supplied from the DC power supply circuit to the control section, and the control section shifts to an operating state.

When the series of sales registration operations is completed, this control unit sends a power cutoff signal to the logic circuit, but if the operator is away from the electronic cash register at this point, an absence signal from the sensor is sent to the logic circuit as well. Since it is sent,
A cutoff signal is sent from this logic circuit to the switching circuit. As a result, the switching circuit is cut off and the drive voltage supplied from the DC power supply circuit to the control section is cut off.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is an external view showing the electronic cash register of the embodiment. Reference numeral 10 in the figure is a housing housing various electronic devices, and on the front of this housing 10 are various registration keys and locking keys such as a total key for inputting sales data such as the sales amount and department code of sold products. Keyboard 1 with
1. Display section 12a for displaying sales data and total amount; report issuing port 13. A drawer 14 etc. for storing money is provided. In addition, a display section 1 for customers is provided on the top surface of the housing 11.
2b is attached.

Furthermore, the keyboard 11 and drawer 14 on the front of the housing 10 are
A sensor 15 is installed between the electronic cash register and the electronic cash register for detecting the presence of an operator in front of the keyboard 11 of the electronic cash register using, for example, an infrared temperature detector.

FIG. 1 is a circuit diagram showing a power supply section of an electronic cash register.

The 100V AC voltage supplied from the AC power supply 16 via the power switch 17 is reduced to a low voltage by the power transformer 18 and then connected to the diode bridge circuit 19g and the smoothing capacitor 1.
9b, the voltage is converted into a DC voltage v1 of, for example, 6 to 8V. This DC voltage v1 is input to the DC power supply circuit 22 via the contact 20a of the relay 20 as a switching circuit and the smoothing capacitor 21.

This DC power supply circuit 22 converts the input DC voltage V1 to +5V.
For example, CP
The signal is supplied to a control section 23 composed of U. Note that this DC power supply circuit 22 transmits the reset signal R5T and the power failure detection signal POFF explained in FIG. 4 to the control unit 2 as necessary.
Send to 3.

The DC voltage V1 output from the rectifier circuit 19 is converted into a constant voltage V2 by a constant voltage circuit 24 consisting of a transistor 24a and a Zener diode 24b.

A constant voltage v2 output from the constant voltage circuit 24 is applied to one end of the drive coil 20b of the relay 20, and an output signal of a NOR gate 25 as a logic circuit is applied to the other end of the drive coil 20b. There is. The output signal of the sensor 15 is input to one input terminal of the NOR gate 25.

The sensor 15 sends out an L level presence signal when an operator is present in front of the keyboard 11, and sends an H level absence signal when the operator is absent.

That is, when an operator is present and the sensor 15 outputs an L level presence signal, the output terminal of the NOR gate 24 becomes L level (ground level) and sends a conduction signal to the relay 20. That is, the drive current flows through the drive coil 20b, and the contact 20a of the relay 20 is closed.

Note that the constant voltage v2 outputted from the constant voltage circuit 24 is input to the sensor 15 and the NOR gate 25 as a driving voltage.

The control section 23 is connected to the keyboard 11, display sections 12a, 12b, drawer 14, printer, etc. shown in FIG. 2 via an address bus 26 and a data bus 27. Also, a timer 28 that measures unit time ΔT
is connected.

Further, a decoder 29 is connected to the address bus 26, and a power cutoff signal outputted from the decoder 29 is inputted to the trigger terminal T of the flip-flop 30.

The data signal DO of the data bus 27 is applied to the input terminal of the flip-flop 30. Further, a reset signal R8T output from the DC power supply circuit 22 is applied to the reset terminal R of the flip-flop 30. Note that the set terminal S of this flip-flop 30 receives a drive voltage V output from the DC power supply circuit 22 . is applied.

The output signal of the output terminal Φ of the flip-flop 30 is connected to the resistor 3.
1 to the base of transistor 32.

The collector of this transistor 32 is connected to the output terminal of the constant voltage circuit 24 via a resistor 33 and also to the other input terminal of the NOR gate 25.

In such a circuit configuration, an operator uses the keyboard 11
When the vehicle is not in the front position and only the power switch 17 is turned on, the sensor 15 outputs an H-level absence signal. Furthermore, since the DC power supply circuit 22 is not operating, the reset terminal R of the flip-flop 30 is at L level. Therefore, the flip-flop 30 enters the reset state, and the first output q maintains the L level. Therefore, the transistor 32 is not conductive and the collector terminal is high.
level condition. As a result, both input terminals of NOR gate 25 go to H level, and the output terminal goes to H level, so relay 20 does not operate. Therefore, the DC voltage v1 is not supplied to the DC power supply circuit 22.

Next, when the operator stands in front of the keyboard 11, the sensor 15 operates and outputs an L level presence signal. the result,
An L-level conductive signal is applied from the NOR gate 25 to a relay 20 serving as a switching circuit, and the contacts of this relay 20 are closed.

When the DC power supply circuit 22 is activated and the output drive voltage vc rises above the lower limit voltage of the allowable range, the reset signal R8T rises to H level, and the reset state of the control unit 23 and the flip-flop 30 is released. be done.

The #I control 11r23 then shifts to its normal operating state.

The reset state of the flip-flop 30 is released and the set terminal S changes to H level, so that the output terminal becomes H level. As a result, the transistor 32 becomes conductive,
The signal input from the collector terminal to the NOR gate 25 is L
Change to level.

Next, when the reset state is released, the control section 23 is programmed to execute the flowchart of FIG. 3.

When the flowchart is started, the count value C of the counter formed in the storage section is cleared to 0. Then, it waits for a predetermined unit time Δt, such as one second, to elapse. When the unit time ΔT has elapsed, it is checked at P2 whether sales data has been inputted from the keyboard 11. If sales data has not been input, add 1 to the count value C of the counter, and then confirm that the count value C after addition has not reached the maximum value C■aX corresponding to the predetermined grace time. Then, the process returns to Pl and waits for the unit time ΔT to elapse.

Then, when the sales data is input at P2, a predetermined sales registration process is executed for the sales data input at P4. Then, at P5, when the end of the sales registration process for one customer is confirmed by, for example, a lock key process, the process returns to the beginning of the flowchart and the count value C of the counter is reset to 0. The system then waits for input of sales data for the next customer.

Further, when no sales data is input at P2 and the count value C is increased by 1, and as a result reaches the maximum value Cwax at P3, a power cutoff signal is output at P6.

That is, the data signal DO of the data bus 27 is set to 1 (
When the trigger of the flip-flop 30 applies an H-level power cutoff signal from the decoder 29 to the terminal T in the state where the input terminal T of the flip-flop 30 is set, the H-level signal applied to the input terminal of the flip-flop 30 is latched. The output level of flip-flop 30 is inverted. Then, an L level power cutoff signal is applied from the output terminal Q to the base of the transistor 32. Thus, the transistor 32 is cut off, and an H level power cutoff signal is applied from the collector terminal of the transistor 23 to the other input terminal of the NOR gate 25.

At this point, if the operator is in front of the keyboard 11, the sensor 15 is outputting an L level presence signal, so the output signal level of the NOR gate 25 remains at the L level and does not change. Therefore, the normal drive voltage VC is supplied to the control section 23, and the control section 23 maintains its operating state.

When the operator leaves the keyboard 11 while the H-level power cutoff signal is applied to the other input terminal of the NOR gate 25, the H-level cutoff signal is output as an AND signal from the NOR gate 25, and the relay 20 contacts are opened. As a result, the supply of DC voltage V to the DC power supply circuit 22 is cut off, and the drive voltage V to the control unit 23 is cut off.
A reset signal is output when C drops to the limit voltage value. After the control unit 23 shifts to the reset state, the drive voltage vc is completely cut off.

With the electronic cash register configured in this way, when the registration process for - customers is completed and a certain amount of time has elapsed, the control unit 23 sends the decoder 29. A power cutoff signal is applied to the NOR gate 25 as a logic circuit via the flip-flop 30 and the transistor 32. If the operator leaves in front of the keyboard 11 at this point, the sensor 15 outputs an absence signal. As a result, a cutoff signal is output from the NOR gate 25, the relay 20 is cut off, and the power supply to the DC power supply circuit 22 and the control unit 23 is completely cut off.

Further, when the operator returns to the position in front of the keyboard 11 with the power to the DC power supply circuit 22 and the control section 23 cut off, power is supplied again and the control section 23 shifts to the operating state.

Furthermore, once the sales registration process for one customer is started in the -tansei section 23, even if the operator leaves the keyboard 11, the control unit will not operate the system until the series of sales registration operations for that customer is completed. 23's power supply will never be cut off.

In this way, the sales registration process for - customers is completed,
When the operator (cashier) leaves the electronic cash register, all power to the control unit is cut off.
Compared to the case where the control section is simply maintained in a hold state as in the conventional electronic cash register shown in FIG. 4, power consumption is significantly reduced. As a result, maintenance costs can be reduced.

In addition, when the operator (cashier) returns to the front of the keyboard 11, the power is automatically turned on and the control unit 23 immediately returns to the operating state, so the customer is not kept waiting and this particularly hinders sales operations. isn't it.

Note that if there are no more customers, the operator can step away from the keyboard 11 for a while and the power to the control unit 23 will be shut off.

[Effects of the Invention] As explained above, according to the electronic cash register of the present invention, a sensor is provided to detect whether the operator is present or absent, and when the sales registration task is completed and the operator leaves the place, The drive voltage to the control unit is automatically cut off. Therefore, it is possible to suppress power consumption when the number of customers is interrupted or when there is no operator, and it is possible to significantly reduce maintenance costs.

[Brief explanation of the drawing]

1 to 3 show an electronic cash register according to an embodiment of the present invention. FIG. 1 is a circuit diagram showing the power supply section, FIG. 2 is an external view, and FIG. 3 is a diagram showing the operation. FIG. 4 is a circuit diagram showing the power supply section of the conventional electronic cash register, and FIG. 5 is a flow chart showing the operation of the conventional electronic cash register. DESCRIPTION OF SYMBOLS 10... Housing, 11... Keyboard, 12a. 12b... Display unit, 15... Sensor, 16... AC power supply, 19... Rectifier circuit, 20... Relay, 22
... DC power supply circuit, 23 ... Control unit, 24 ... Constant voltage circuit, 25 ... NOR gate, 30 ... Flip-flop. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] The keyboard for inputting sales data and the display section for displaying sales data are installed on the front of the housing, and are equipped with a sensor that detects whether an operator is present or absent in front of the keyboard, a rectifier circuit for the AC power supply, and an input panel. a switching circuit interposed between a DC power supply circuit that supplies a drive voltage to a control unit that executes predetermined sales registration operations on sales data;
A presence signal outputted from the sensor is sent as a conduction signal to the switching circuit, and an AND signal of a power cutoff signal outputted from the control section and an absence signal outputted from the sensor after the completion of the sales registration business is generated. An electronic cash register comprising: a logic circuit that sends a cutoff signal to the switching circuit.